CA1327225C - Show case for keeping and exhibiting objects - Google Patents
Show case for keeping and exhibiting objectsInfo
- Publication number
- CA1327225C CA1327225C CA000591549A CA591549A CA1327225C CA 1327225 C CA1327225 C CA 1327225C CA 000591549 A CA000591549 A CA 000591549A CA 591549 A CA591549 A CA 591549A CA 1327225 C CA1327225 C CA 1327225C
- Authority
- CA
- Canada
- Prior art keywords
- show case
- air
- interior
- pressure
- show
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
- A47F3/00—Show cases or show cabinets
- A47F3/001—Devices for lighting, humidifying, heating, ventilation
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Packages (AREA)
- Freezers Or Refrigerated Showcases (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Show case for keeping and exhibiting objects, the sides, bottom and cover construction of which enclose the interior of the show case more or less hermetically. The show case includes a filter system comprising preferably dust and/or gas protection filters which is disposed in an air vent enabling clean air to flow into or to be directed into the show case. When air flows in automatically due to changed pressure and temperature conditions inside and outside the show case, the show case is vented preferably through an air vent formed as an outlet valve. When it is impossible to sufficiently seal the show case, it will be ventilated forcibly with the least possible quantity of air by means of a pump or ventilating device connected to the interior of the show case through the filter means, which quantity of air is related to the air volumes flowing automatically into the show case when the air pressure increases suddenly or the temperature varies.
Show case for keeping and exhibiting objects, the sides, bottom and cover construction of which enclose the interior of the show case more or less hermetically. The show case includes a filter system comprising preferably dust and/or gas protection filters which is disposed in an air vent enabling clean air to flow into or to be directed into the show case. When air flows in automatically due to changed pressure and temperature conditions inside and outside the show case, the show case is vented preferably through an air vent formed as an outlet valve. When it is impossible to sufficiently seal the show case, it will be ventilated forcibly with the least possible quantity of air by means of a pump or ventilating device connected to the interior of the show case through the filter means, which quantity of air is related to the air volumes flowing automatically into the show case when the air pressure increases suddenly or the temperature varies.
Description
~32722~
The invention relates to show cases for keeping and for exhibiting objects, the sides, the bottom and the cover construction of which encompass the interior of the show case more or less herme~lcally in order -to protect sald ob~ects against dust and environmental loads of all kind. No matter how good and nearly perfect a show case is sealed, it must be expected in practice that, du~ to variations of air pressure and temperature in the show case and in its ambient atmosphere, air and also dust reach the interior of the show case. Especially in case of air pressure variations occurring when high and low barometric pressure conditions alternate, each show case draws in up to l/lOth of its volume.
In order to protect the objects in show cases agains-t ambient temperature variations or in ordér to maintain a predetermined temperature inside the show cases, it is general practice to provide show cases with an air conditioning system. However, such equipment is, on the one hand, very expensive and is suitable only for very expensive exhibits, and, on the other hand, it does not prevent harmful gases from entering the interior of the show cases together with air and from attacking the exhibits.
Furthermore, it turned out that, depending on the system, strong air flows may detrimentally affect some objects. Moreover, show cases connected to such air conditioning systems must be stationarily installed - usually along walls. Also such air conditioning systems can cause great damage in case of malfunction.
It is an object of the invention to provide show cases in which the objects accommodated therein are protected against environmental influences with the least possible technical expenditure and cost.
. ~; . :,:; - : ~, It is another object of the invention to provide a show case which is in a condition to be retrofitted and need not be stationar~.
According to one object of the present invention, steps are taken to ensure that the ven~ilation of the show case iB ~ected at any rate through filter means. The simplest solution to achieve such a ventilation is to cause the air supply through the filter means to occur automatically due to an increase of pressure; said filter means have the ef~ect that the air no longer enters the show case through seals but through the filter, to provide clean air. When the pressure in the vicinity of the show case decreases or, for example, when the temperature increases in the show case when the illumination is turned on, the show case again -delivers clean air outwardly from the interior of the show case. The necessary installations ~or such a "self-b.reathing" show case are very economical and easy to install. It is possible to provide the : bottom of the show case for example with air inlet tubes and air vents, the air inlet tubes being provided with a filter unit with an air inlet valve in front thereof, while the air vents may be provided with a vent valve.
When the sealing of a show case is rather insufficient and the show case cannot be sealed sufficiently enough to guarantee that the en-trance of air does not -take place except through the filter, .
the show case is subjected to a forced ventilation -again through the filter means. For this forced ventilation there is used a source which contains compressed air or wherein the air is compressed or ventilated before being supplied to the show case.
pump or fan used is therefore preset in such a way that it maintains the interior of the show case at a .. ..
~32722~
pressure which is slightly in excess of the atmospheric pressure of the environment and supplies only very small air volumes which correspond to those air volumes "breathed" by the show case not provided S with said pump or fan means in case the atmospheric pressure decreases or increases rapidly. ~ence, the source supplies only the least quantity o air which is necessary to supply sufficient volumes o~ cleaned air also when temperature variations are very high so that unpurified air is prevented from entering through holes or insufficient sealings of the show case. Also in case of large show cases a simple, low-priced and relatively small pump or fan is sufficient so that the installation expenses as well as the operating expenses are very low.
Due to the low ra-te of air flow in the self-breathing case as well as in show cases with forced ventilation it is seldom necessary to change the filters. It is advisable to use standard filters 2~ to be screwed on, such as common filter elements for gas masks, which can quickly and easily be screwed on vent tubes provided in one of the sides of the case.
According to ano-ther object of the invention, a pressure sensor and a control unit are used for activating the pump and a ventilator, respectively, only when the external pressure increases so that contamination of the filter in a show case with forced ventilation is further reduced in favour of its working life.
According to another object of the invention a show case with forced ventilation and extremely low flow rate is provided with a low-priced air conditioning and control of air humidity of the interior of the show case is ensured by connecting the pump to a refrigerator or to a refrigerator provided with a hygrostat. In this way it is possible .. . .
:
... .. . .
.. : ., ........... , . : :, , : ~ . -. :: :: ;, : : ,~
132~22~
to clean, to dry and to control the humidity of individual show cases in a simple manner and at a reasonable price without connecting them to expensive air conditioning systems.
According to a further object of the invention, a pressure monitor means is connected to a show case with forced ventilation and the delivery of the pump is controlled and adjusted by a corresponding control line. Moreover, it is possible to indi~ate a failure of the pump as well as unallowed penetration into the show case which also causes a sudden pressure drop.
According to another object of the invention, there is provided a show case for keeping and displaying objects, which has sides, a bottom, a cover and an interior therebetween, means for connecting said bottom, said sides and said cover which provide non-hermetic sealing therebetween, whereby said show case is exposed to variations in pressure and temperature in the interior thereof and in the environment and dust and harmful gases would enter the interior of said show case, means for preventing dust and gases from entering said interior of the show case, comprising air inlet means at least at the bottom or the cover and filtering means within said air inlet means for filtering and cleaning said air whereby when the pressure increases in the environment, filtered air flows into the interior of said show case.
According to yet another object of the invention, there is provided a show case for keeping and displaying objects comprising a base and a show case ~body having a cover, sides and an interior therebetween, means for connecting said base, said cover, said sides which provide non-hermetic sealing whereby said interior is exposed to variations in ~327~
temperature and pressure in said interior and in theenvironment, pump means connected to the interior of said show case body by means of air inlet means and forcibly ventilating said interior; filter means provided upstream or downstream of said pump means, whereby filtered air is introduced into said interior in an amount corresponding to the unfiltered air volumes which otherwise would flow per unit time into said show case due to an increased air pressure in the environm~nt.
In the accompanying drawings Fig. 1 illustrates schematically an embodiment of a show case according to the invention in the form of a self-breathing show case, and Fig. 2 is a schematic illustration of an embodiment of a show case according to the invention with forced ventilation.
The longitudinal section of the self-breathing show case 1 illustrated in Fig.
comprises an illumination box 2 preferably of aluminum, a base 3 for the show case preferably of aluminum and/or steel and a transparent show case body 4 made of glass preferably float glass. A
di~ferent transparent material, for example plastic material is possible, too. The case is provided with air inlet and outlet vents ~B and E, respectively). The interior of the show case is substantially sealed for example by means of plastic profiles for sealing the joints of the glass panes of the case body 4, the illumination box 2 and base 3. In the present embodiment a glass cement (SH 10) and silicone were used to glue and seal the joining edges. ~t is also possible to use neoprene instead of silicone. ~t any -~ - 4a -~27225 rate, materials having the same thermal coefficient of expansion are advantageously used for the show case body 4.
At the bottom of the show case body 4 air vents 5 and 6 are provided, the inlet air vent 5 being provided inside with a dust filter and/or gas protection filter 7 for chemical defense as well as with an inlet membrane valve 8, and the U-shaped air vent 6 for air release being provided with a corresponding outlet membrane valve 9. As the air supply and release are separately provided, the filter is preserved as much as possible so tha-t its working life is lengthened. The membrane valves 8 and 9 are preferably membrane valves of the kind used for respirators.
The air vent 5 is shaped and provided with a threaded tube or plug connection means, by means of which commercially available reasonably priced standard combination filters can be screwed or attached on the vent piece made of metal or pleastics material. The filter can be exchanged quickly and without problems. A suitable combination filter is the dust and gas protection filter, "Drager-Kombinationsfilter 620 ST A2B2E2K2-P3".
In case of air pressure, variations in the environment and also of ambient temperature variations depending thereon either a corresponding quantity of cleaned air is supplied into the interior of the show case through the filter or a corresponding amount of air leaves the show case through the air vent 6. A show case sealed with plastic profiles draws in about l/lO of its volume in case of barometric changes from high pressure -to low pressure conditions and about l/273 of its volume in case of a DV temperature drop of one deyree Kelvin.
Even if the show case is very well sealed, an air ~ ::, . : , 2 2 ~
circulation of about 50 % of the total volume must be expected per month so that the step of filtering whiah eliminates dust and harm~ul substances such as hydrogen sulphide has an important effect by preventing exhibited obiects from becoming covered with dust and from tarnishing for many years.
Changing the filters becomes necessary only about every one or two years due to the low filter throughput so that the cost for cleaning the air (about DM 10 to 50 per filter) and maintenance service are very low. Also the expenditure for work involved as well as the cost for the installation of the vent means as shown are low.
The installation and the type of the filter are, on the other hand, subs-tantially at will. A
filter may, for instance, also be provided on the upper side of the show case. Another possibility is not to provide a vent for air release because air may escape through the sealings which are never hermetical.
The show case 1' with forced ventilation illustrated in Fig. 2 and comprising base 3, transparent show case body 4 and illumination box ~
is provided with a ventilation pump 10 provided below the bottom plate of the show case body 4 and extending into the base 3 of the show case. This : pump is a low--priced aquarium pump of low output and is connected to an air vent 5' through a corresp.onding air conduit in the form of an air tube and pumps through said air vent 5', including a gas/dust protection fi.lter 7, clean air into the show case.
Such a forced ventilation is suited particularly for show case bodies which can be sealed only very insuEficiently or with difficulty. The pump requires only a very low delivery output which ,. . : . , , : .
,: :
, . :~ .... :. -::
~32722~
is ad~usted preferably to the volume per time unit which would otherwise flow automatically into the show case in case the air pressure rises quickly.
With a supposed maximal rise of air pressure of about 7 hpa this would correspond to about 7 liters per hour for a show case having an air volume of about 100~ 1. A supply volume of about 10 1 per hour would therefore be sufficient and is possible with standard aquarium pumps or any kind of membrane pump.
Inslde the show case, there is always produced by the pump a minor excess pressure compared to the atmospheric pressure of the environment so that dust and harmful gases are prevented from entering inside the show case through slots or leaks and the air is supplied exclusively through the filter. On the other hand, evaporations of the lining and of the decoration means inside the show case which impair the atmosphere in the show case can be delivered outwards through slots or leaks in the sealing due to the slight excess pressure.
The pump 10 can be electrically connected to the same connection cable as the other installations of the show case, i.e. for example its illumination device. According to a non illustrated embodiment it is also possible to mount the pump in the illumination box or on the rear side o~ a show case which is not self supporting. The pump may also be disposed outside the show case and connected thereto only by an air hose. Due to the minor delivery output of the pump it is possible to ventilate by force a plurality of show cases with a single pump.
Instead of the air pump a fan can be used, or a reservoir containing purified air or a neutral gas such as argon or nitrogen under high pressure, can be connected to the interior of the show case by - : ;:
~ 32722~ :
means of a pre~ure reducing valve and/or mixing valve. It is also advantageous to use gaseous additions with conservlng effects or effecting some ~ind of pest control.
S The show case with forced ventilation according to the invention can be used with advantage if the show case is to be used under a climate that can be controlled or in a dry climate. In order to produce an especially dry atmosphere in the show case which retards the chemical reactions with metal objects, the show case is sea]ed as well as possible by means of plastic profiles and adhesives disposed between the edges of the glass panes. A refrigerator is placed outside the show case and air is supplied to the refrigerator through a filter provided in the air supply of the refrigerator. Cooled "dried" air at about -20C is directed into the body of the show case by means of a pump and corresponding air ducts.
When the air is heated again tn room temperature, its relative humidity is extremely low (under 5 ~) so that time-consuming preserving works for special moisture-sensitive exhibition objects are entirely unnecessary. The air may also be filtered according to this further embodiment by pumping dry air from behind through a filter provided at the base of the show case. The pump and the refrigerator must produce, at any rate, only very low output and cooling power, respectively. The cooling power of a common refrigerator is much higher than the very small amount of air supplied at the rate of several liters per hour.
When exhibits require a predetermined constant air humidity, the show case according to the invention with forced ventilation can be modified into a show case with controlled air humidity by means of a hygrostat and a refrigerator. For this - , .
, .. . ~ . ~
~327225 -purpose, clean air ls supplied to a refrigerator through a laterially mounted gas protection and dust protection filter and is guided through a container fille~ wi~h wat~r which is placed within the refrigerator. By means of a small aquarium pump connected to the refrigerator cleaned air is again supplie~ by means of flexible tubes first to the hygrostat and then to the inside of the show case.
The hygrostat is.mounted in a small measuring case 10 comprising air with a humidi-ty corresponding with that inside the show case. The small measuring case may be mounted on an ou-tside wall of the show case or on the housing of the refrigerator for the pump.
control line extends between the hygrostat and the lS refrigerator. When the humidity of the air is too hlgh the hygrostat turns on the refrigerator, when it is too low the hygrostat turns the refrigerator off.
Also for this development of the show case according . to the invention with forced ventilation the installation cost as well as the operating cost are extremely low because of the small flow of air. The power used for pumping and cooling is again very small.
A pressure monitoring and control device in the form of a pressure sensor giving a signal upon a sudden pressure drop can be connected to the show case to detect a failure of the pump for a show case with forced ventilation with or without climate control. The pump keeps the internatl pressure in the show case at an increased level so that the pressure control device reliably responds upon a pressure drop. Preferably, the pressure control device which comprises a pressure sensor inside the show case controls the delivery of the pump through a control line connected to the pump so that a predetermined air pressure is always maintained g _ . ! ~, : j ' : ' , , .-r t : ' . ' ' . .,: ' ' '~ ' .
,. . . j : ~ :;:
~2722~
inside the show case. Resistance manometers or manometer capsules can be used as pressure sensors, for example. A pressure drop below a predetermined value is detected by the pressure contxol device by comparison means and supplied through switching means connected to the device to produce a visible or audible signal in a central station through a line corresponding thereto when the pump breaks down.
Moreover, it is advantageous that a si~nal be produced upon an unallowed opening of the show case which also results in a sudden pressure drop so that other expensive monitoring systems are not required and it is sufficient to connect an alarm line or system to the switching means to signal an unauthorized entry into the case.
Besides the possibili-ty of controlling the air pressure inside the show case, the external pressure can also be controlled by means of a pressure sensor. The measured result is Eed to a control device connected to the pump or a ven-tilating device or also to the valve of a reservoir so that the air supply is initiated by the control device only when the external pressure increases.
.. .
;
.. - : : .: :
. .
The invention relates to show cases for keeping and for exhibiting objects, the sides, the bottom and the cover construction of which encompass the interior of the show case more or less herme~lcally in order -to protect sald ob~ects against dust and environmental loads of all kind. No matter how good and nearly perfect a show case is sealed, it must be expected in practice that, du~ to variations of air pressure and temperature in the show case and in its ambient atmosphere, air and also dust reach the interior of the show case. Especially in case of air pressure variations occurring when high and low barometric pressure conditions alternate, each show case draws in up to l/lOth of its volume.
In order to protect the objects in show cases agains-t ambient temperature variations or in ordér to maintain a predetermined temperature inside the show cases, it is general practice to provide show cases with an air conditioning system. However, such equipment is, on the one hand, very expensive and is suitable only for very expensive exhibits, and, on the other hand, it does not prevent harmful gases from entering the interior of the show cases together with air and from attacking the exhibits.
Furthermore, it turned out that, depending on the system, strong air flows may detrimentally affect some objects. Moreover, show cases connected to such air conditioning systems must be stationarily installed - usually along walls. Also such air conditioning systems can cause great damage in case of malfunction.
It is an object of the invention to provide show cases in which the objects accommodated therein are protected against environmental influences with the least possible technical expenditure and cost.
. ~; . :,:; - : ~, It is another object of the invention to provide a show case which is in a condition to be retrofitted and need not be stationar~.
According to one object of the present invention, steps are taken to ensure that the ven~ilation of the show case iB ~ected at any rate through filter means. The simplest solution to achieve such a ventilation is to cause the air supply through the filter means to occur automatically due to an increase of pressure; said filter means have the ef~ect that the air no longer enters the show case through seals but through the filter, to provide clean air. When the pressure in the vicinity of the show case decreases or, for example, when the temperature increases in the show case when the illumination is turned on, the show case again -delivers clean air outwardly from the interior of the show case. The necessary installations ~or such a "self-b.reathing" show case are very economical and easy to install. It is possible to provide the : bottom of the show case for example with air inlet tubes and air vents, the air inlet tubes being provided with a filter unit with an air inlet valve in front thereof, while the air vents may be provided with a vent valve.
When the sealing of a show case is rather insufficient and the show case cannot be sealed sufficiently enough to guarantee that the en-trance of air does not -take place except through the filter, .
the show case is subjected to a forced ventilation -again through the filter means. For this forced ventilation there is used a source which contains compressed air or wherein the air is compressed or ventilated before being supplied to the show case.
pump or fan used is therefore preset in such a way that it maintains the interior of the show case at a .. ..
~32722~
pressure which is slightly in excess of the atmospheric pressure of the environment and supplies only very small air volumes which correspond to those air volumes "breathed" by the show case not provided S with said pump or fan means in case the atmospheric pressure decreases or increases rapidly. ~ence, the source supplies only the least quantity o air which is necessary to supply sufficient volumes o~ cleaned air also when temperature variations are very high so that unpurified air is prevented from entering through holes or insufficient sealings of the show case. Also in case of large show cases a simple, low-priced and relatively small pump or fan is sufficient so that the installation expenses as well as the operating expenses are very low.
Due to the low ra-te of air flow in the self-breathing case as well as in show cases with forced ventilation it is seldom necessary to change the filters. It is advisable to use standard filters 2~ to be screwed on, such as common filter elements for gas masks, which can quickly and easily be screwed on vent tubes provided in one of the sides of the case.
According to ano-ther object of the invention, a pressure sensor and a control unit are used for activating the pump and a ventilator, respectively, only when the external pressure increases so that contamination of the filter in a show case with forced ventilation is further reduced in favour of its working life.
According to another object of the invention a show case with forced ventilation and extremely low flow rate is provided with a low-priced air conditioning and control of air humidity of the interior of the show case is ensured by connecting the pump to a refrigerator or to a refrigerator provided with a hygrostat. In this way it is possible .. . .
:
... .. . .
.. : ., ........... , . : :, , : ~ . -. :: :: ;, : : ,~
132~22~
to clean, to dry and to control the humidity of individual show cases in a simple manner and at a reasonable price without connecting them to expensive air conditioning systems.
According to a further object of the invention, a pressure monitor means is connected to a show case with forced ventilation and the delivery of the pump is controlled and adjusted by a corresponding control line. Moreover, it is possible to indi~ate a failure of the pump as well as unallowed penetration into the show case which also causes a sudden pressure drop.
According to another object of the invention, there is provided a show case for keeping and displaying objects, which has sides, a bottom, a cover and an interior therebetween, means for connecting said bottom, said sides and said cover which provide non-hermetic sealing therebetween, whereby said show case is exposed to variations in pressure and temperature in the interior thereof and in the environment and dust and harmful gases would enter the interior of said show case, means for preventing dust and gases from entering said interior of the show case, comprising air inlet means at least at the bottom or the cover and filtering means within said air inlet means for filtering and cleaning said air whereby when the pressure increases in the environment, filtered air flows into the interior of said show case.
According to yet another object of the invention, there is provided a show case for keeping and displaying objects comprising a base and a show case ~body having a cover, sides and an interior therebetween, means for connecting said base, said cover, said sides which provide non-hermetic sealing whereby said interior is exposed to variations in ~327~
temperature and pressure in said interior and in theenvironment, pump means connected to the interior of said show case body by means of air inlet means and forcibly ventilating said interior; filter means provided upstream or downstream of said pump means, whereby filtered air is introduced into said interior in an amount corresponding to the unfiltered air volumes which otherwise would flow per unit time into said show case due to an increased air pressure in the environm~nt.
In the accompanying drawings Fig. 1 illustrates schematically an embodiment of a show case according to the invention in the form of a self-breathing show case, and Fig. 2 is a schematic illustration of an embodiment of a show case according to the invention with forced ventilation.
The longitudinal section of the self-breathing show case 1 illustrated in Fig.
comprises an illumination box 2 preferably of aluminum, a base 3 for the show case preferably of aluminum and/or steel and a transparent show case body 4 made of glass preferably float glass. A
di~ferent transparent material, for example plastic material is possible, too. The case is provided with air inlet and outlet vents ~B and E, respectively). The interior of the show case is substantially sealed for example by means of plastic profiles for sealing the joints of the glass panes of the case body 4, the illumination box 2 and base 3. In the present embodiment a glass cement (SH 10) and silicone were used to glue and seal the joining edges. ~t is also possible to use neoprene instead of silicone. ~t any -~ - 4a -~27225 rate, materials having the same thermal coefficient of expansion are advantageously used for the show case body 4.
At the bottom of the show case body 4 air vents 5 and 6 are provided, the inlet air vent 5 being provided inside with a dust filter and/or gas protection filter 7 for chemical defense as well as with an inlet membrane valve 8, and the U-shaped air vent 6 for air release being provided with a corresponding outlet membrane valve 9. As the air supply and release are separately provided, the filter is preserved as much as possible so tha-t its working life is lengthened. The membrane valves 8 and 9 are preferably membrane valves of the kind used for respirators.
The air vent 5 is shaped and provided with a threaded tube or plug connection means, by means of which commercially available reasonably priced standard combination filters can be screwed or attached on the vent piece made of metal or pleastics material. The filter can be exchanged quickly and without problems. A suitable combination filter is the dust and gas protection filter, "Drager-Kombinationsfilter 620 ST A2B2E2K2-P3".
In case of air pressure, variations in the environment and also of ambient temperature variations depending thereon either a corresponding quantity of cleaned air is supplied into the interior of the show case through the filter or a corresponding amount of air leaves the show case through the air vent 6. A show case sealed with plastic profiles draws in about l/lO of its volume in case of barometric changes from high pressure -to low pressure conditions and about l/273 of its volume in case of a DV temperature drop of one deyree Kelvin.
Even if the show case is very well sealed, an air ~ ::, . : , 2 2 ~
circulation of about 50 % of the total volume must be expected per month so that the step of filtering whiah eliminates dust and harm~ul substances such as hydrogen sulphide has an important effect by preventing exhibited obiects from becoming covered with dust and from tarnishing for many years.
Changing the filters becomes necessary only about every one or two years due to the low filter throughput so that the cost for cleaning the air (about DM 10 to 50 per filter) and maintenance service are very low. Also the expenditure for work involved as well as the cost for the installation of the vent means as shown are low.
The installation and the type of the filter are, on the other hand, subs-tantially at will. A
filter may, for instance, also be provided on the upper side of the show case. Another possibility is not to provide a vent for air release because air may escape through the sealings which are never hermetical.
The show case 1' with forced ventilation illustrated in Fig. 2 and comprising base 3, transparent show case body 4 and illumination box ~
is provided with a ventilation pump 10 provided below the bottom plate of the show case body 4 and extending into the base 3 of the show case. This : pump is a low--priced aquarium pump of low output and is connected to an air vent 5' through a corresp.onding air conduit in the form of an air tube and pumps through said air vent 5', including a gas/dust protection fi.lter 7, clean air into the show case.
Such a forced ventilation is suited particularly for show case bodies which can be sealed only very insuEficiently or with difficulty. The pump requires only a very low delivery output which ,. . : . , , : .
,: :
, . :~ .... :. -::
~32722~
is ad~usted preferably to the volume per time unit which would otherwise flow automatically into the show case in case the air pressure rises quickly.
With a supposed maximal rise of air pressure of about 7 hpa this would correspond to about 7 liters per hour for a show case having an air volume of about 100~ 1. A supply volume of about 10 1 per hour would therefore be sufficient and is possible with standard aquarium pumps or any kind of membrane pump.
Inslde the show case, there is always produced by the pump a minor excess pressure compared to the atmospheric pressure of the environment so that dust and harmful gases are prevented from entering inside the show case through slots or leaks and the air is supplied exclusively through the filter. On the other hand, evaporations of the lining and of the decoration means inside the show case which impair the atmosphere in the show case can be delivered outwards through slots or leaks in the sealing due to the slight excess pressure.
The pump 10 can be electrically connected to the same connection cable as the other installations of the show case, i.e. for example its illumination device. According to a non illustrated embodiment it is also possible to mount the pump in the illumination box or on the rear side o~ a show case which is not self supporting. The pump may also be disposed outside the show case and connected thereto only by an air hose. Due to the minor delivery output of the pump it is possible to ventilate by force a plurality of show cases with a single pump.
Instead of the air pump a fan can be used, or a reservoir containing purified air or a neutral gas such as argon or nitrogen under high pressure, can be connected to the interior of the show case by - : ;:
~ 32722~ :
means of a pre~ure reducing valve and/or mixing valve. It is also advantageous to use gaseous additions with conservlng effects or effecting some ~ind of pest control.
S The show case with forced ventilation according to the invention can be used with advantage if the show case is to be used under a climate that can be controlled or in a dry climate. In order to produce an especially dry atmosphere in the show case which retards the chemical reactions with metal objects, the show case is sea]ed as well as possible by means of plastic profiles and adhesives disposed between the edges of the glass panes. A refrigerator is placed outside the show case and air is supplied to the refrigerator through a filter provided in the air supply of the refrigerator. Cooled "dried" air at about -20C is directed into the body of the show case by means of a pump and corresponding air ducts.
When the air is heated again tn room temperature, its relative humidity is extremely low (under 5 ~) so that time-consuming preserving works for special moisture-sensitive exhibition objects are entirely unnecessary. The air may also be filtered according to this further embodiment by pumping dry air from behind through a filter provided at the base of the show case. The pump and the refrigerator must produce, at any rate, only very low output and cooling power, respectively. The cooling power of a common refrigerator is much higher than the very small amount of air supplied at the rate of several liters per hour.
When exhibits require a predetermined constant air humidity, the show case according to the invention with forced ventilation can be modified into a show case with controlled air humidity by means of a hygrostat and a refrigerator. For this - , .
, .. . ~ . ~
~327225 -purpose, clean air ls supplied to a refrigerator through a laterially mounted gas protection and dust protection filter and is guided through a container fille~ wi~h wat~r which is placed within the refrigerator. By means of a small aquarium pump connected to the refrigerator cleaned air is again supplie~ by means of flexible tubes first to the hygrostat and then to the inside of the show case.
The hygrostat is.mounted in a small measuring case 10 comprising air with a humidi-ty corresponding with that inside the show case. The small measuring case may be mounted on an ou-tside wall of the show case or on the housing of the refrigerator for the pump.
control line extends between the hygrostat and the lS refrigerator. When the humidity of the air is too hlgh the hygrostat turns on the refrigerator, when it is too low the hygrostat turns the refrigerator off.
Also for this development of the show case according . to the invention with forced ventilation the installation cost as well as the operating cost are extremely low because of the small flow of air. The power used for pumping and cooling is again very small.
A pressure monitoring and control device in the form of a pressure sensor giving a signal upon a sudden pressure drop can be connected to the show case to detect a failure of the pump for a show case with forced ventilation with or without climate control. The pump keeps the internatl pressure in the show case at an increased level so that the pressure control device reliably responds upon a pressure drop. Preferably, the pressure control device which comprises a pressure sensor inside the show case controls the delivery of the pump through a control line connected to the pump so that a predetermined air pressure is always maintained g _ . ! ~, : j ' : ' , , .-r t : ' . ' ' . .,: ' ' '~ ' .
,. . . j : ~ :;:
~2722~
inside the show case. Resistance manometers or manometer capsules can be used as pressure sensors, for example. A pressure drop below a predetermined value is detected by the pressure contxol device by comparison means and supplied through switching means connected to the device to produce a visible or audible signal in a central station through a line corresponding thereto when the pump breaks down.
Moreover, it is advantageous that a si~nal be produced upon an unallowed opening of the show case which also results in a sudden pressure drop so that other expensive monitoring systems are not required and it is sufficient to connect an alarm line or system to the switching means to signal an unauthorized entry into the case.
Besides the possibili-ty of controlling the air pressure inside the show case, the external pressure can also be controlled by means of a pressure sensor. The measured result is Eed to a control device connected to the pump or a ven-tilating device or also to the valve of a reservoir so that the air supply is initiated by the control device only when the external pressure increases.
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;
.. - : : .: :
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Claims (10)
1. A show case for keeping and displaying objects, which has sides, a bottom, a cover and an interior therebetween, means for connecting said bottom, said sides and said cover which provide non-hermetic sealing therebetween, whereby said show case is exposed to variations in pressure and temperature in the interior thereof and in the environment and dust and harmful gases would enter the interior of said show case, means for preventing dust and gases from entering said interior of the show case, comprising air inlet means at least at the bottom or the cover and filtering means within said air inlet means for filtering and cleaning said air whereby when the pressure increases in the environment, filtered air flows into the interior of said show case.
2. The show case according to claim 1, which is provided with a first air vent at the bottom and said filtering means comprise a dust and gas protection filter mounted onto said air vent.
3. The show case according to claim 2, wherein said air vent is provided with a first valve allowing only air flow into the show case, and a second air vent is provided with an outlet valve for removing air from said show case when the pressure in the interior thereof decreases.
4. A show case for keeping and displaying objects comprising a base and a show case body having a cover, sides and an interior therebetween, means for connecting said base, said cover, said sides which provide non hermetic sealing whereby said interior is exposed to variations in temperature and pressure in said interior and in the environment, pump means connected to the interior of said show case body by means of air inlet means and forcibly ventilating said interior; filter means provided upstream or downstream of said pump means, whereby filtered air is introduced into said interior in an amount corresponding to the unfiltered air volumes which otherwise would flow per unit time into said show case due to an increased air pressure in the environment.
5. The show case according to claim 4, wherein said filter means comprise a dust and gas protection filter mounted on an air vent provided at the bottom of the show case.
6. The show case according to claim 4, wherein said show case body has an illumination box and said pump means is located in the base of the show case body or in said illumination box.
7. The show case according to claim 6, wherein the atmospheric pressure in the environment of the show case body is measured by means of a pressure sensor, the show case body is provided with control means connected to said pump means and said pressure sensor is connected to said control means, whereby the pump means is activated only in response to an increase in pressure in the environment.
8. The show case according to claim 4, which is provided with refrigerator means for controlling the humidity of the air supplied to the interior of said show case.
9. The show case according to claim 6, wherein a pressure monitoring means is provided to detect the pressure in the interior of said show case and to control it by means of a control line connected to said pump means and the pressure means are provided with a device for signaling a sudden pressure drop.
10. The show case according to claim 9, wherein said device is an alarm system.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3805212.1-16 | 1988-02-19 | ||
| DE3805212A DE3805212A1 (en) | 1988-02-19 | 1988-02-19 | VITRINE FOR STORING AND / OR DISPLAYING ITEMS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1327225C true CA1327225C (en) | 1994-02-22 |
Family
ID=6347742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000591549A Expired - Lifetime CA1327225C (en) | 1988-02-19 | 1989-02-20 | Show case for keeping and exhibiting objects |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4951555A (en) |
| EP (1) | EP0329119B1 (en) |
| AT (1) | ATE80538T1 (en) |
| CA (1) | CA1327225C (en) |
| DE (1) | DE3805212A1 (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2976755B2 (en) * | 1993-08-06 | 1999-11-10 | 株式会社ダイフク | Luggage storage device |
| US5715998A (en) * | 1996-10-17 | 1998-02-10 | Sula; Suleiman S. | Combined humidity gauge and fan for a humidor |
| US6024775A (en) * | 1997-08-06 | 2000-02-15 | Miller; Jack V. | Sealed case with closed-cycle filter system |
| KR19990017123A (en) * | 1997-08-21 | 1999-03-15 | 남해석 | Exhibit Preservation Device |
| DE19826930C2 (en) * | 1998-05-25 | 2002-09-05 | Juerg Steiner | Air-conditioned showcase and system of such showcases |
| DE10128348B4 (en) * | 2001-06-13 | 2006-12-07 | Glasbau Hahn Gmbh + Co Kg | Method for air conditioning a showcase and apparatus for carrying out the method |
| DE20118412U1 (en) | 2001-11-13 | 2002-02-28 | Barath, Gisela, 41472 Neuss | Presentation arrangement and movable wall element |
| GB2393799B (en) * | 2002-08-22 | 2006-03-08 | Richard Gatley | Gas flow control systems |
| DE10324685B4 (en) * | 2003-05-30 | 2006-03-30 | Glasbau Hahn Gmbh + Co. Kg | Showcase for storage and / or display of objects |
| US8246724B2 (en) | 2003-05-30 | 2012-08-21 | Glasbau Hahn Gmbh | Method for air treatment in a display cabinet and cabinet for implementing the method |
| DE102004027750A1 (en) * | 2004-06-07 | 2006-01-05 | Glasbau Hahn Gmbh + Co. Kg | Showcase for storage and / or display of objects |
| US20070062983A1 (en) * | 2005-09-20 | 2007-03-22 | Barnett Michael J | Display case |
| EP2052644B1 (en) * | 2007-10-22 | 2017-11-29 | Goppion S.p.A. | Protection and display case |
| CN101963381A (en) * | 2009-07-22 | 2011-02-02 | 沈阳航天新阳速冻设备制造有限公司 | Humidity regulator |
| US10145574B2 (en) * | 2009-12-10 | 2018-12-04 | Component Hardware Group, Inc. | Vent port for a refrigerated cabinet |
| DE202011051718U1 (en) | 2011-10-21 | 2013-01-25 | Glasbau Hahn Gmbh | Showcase for the display of objects |
| DE102016102925A1 (en) | 2016-02-19 | 2017-08-24 | Norbert Otto | Showcase for presentation and / or storage of objects |
| US11470986B2 (en) * | 2019-01-18 | 2022-10-18 | Jerome S. Feig | Anoxic microclimate storage and display device |
| KR102583181B1 (en) * | 2023-04-12 | 2023-09-26 | 주식회사 큐원 | Showcase with oxigen removing function |
| KR102620403B1 (en) * | 2023-07-10 | 2024-01-03 | 주식회사 한성쇼케이스 | Show case |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE280539C (en) * | ||||
| US2639958A (en) * | 1951-10-04 | 1953-05-26 | E O Bulman Mfg Company Inc | Humidor cigar case |
| FR1153408A (en) * | 1953-02-06 | 1958-03-10 | Device to prevent fogging on closed showcases | |
| US3545832A (en) * | 1968-07-03 | 1970-12-08 | Jos M Linsey Corp | Heated display case |
| US3650039A (en) * | 1970-01-13 | 1972-03-21 | Joseph J Harding | Silverware cabinet |
| FR2459637A1 (en) * | 1979-06-22 | 1981-01-16 | Perrier Sa Alain | Glass case for displaying works of art - has transparent, airtight cover maintaining inert atmosphere supplied by gas bottle under display stand |
| US4315579A (en) * | 1979-12-17 | 1982-02-16 | Martin Jr Timothy J | Venting and filtering mechanism for milk tank vent |
| US4668484A (en) * | 1984-02-13 | 1987-05-26 | Elliott David J | Transport containers for semiconductor wafers |
| JPS6162740A (en) * | 1984-09-03 | 1986-03-31 | Sanki Eng Co Ltd | Blower cleaning device for clean tunnel |
| CH667712A5 (en) * | 1985-10-02 | 1988-10-31 | Landis & Gyr Ag | Work station for providing a stabilized air temperature in a chamber. |
| US4749241A (en) * | 1986-10-29 | 1988-06-07 | The J. Paul Getty Trust | Display case |
| DE8632435U1 (en) * | 1986-12-03 | 1987-08-20 | Muhlack Kiel GmbH, 2300 Kiel | Exhibition showcase |
| US4804392A (en) * | 1987-09-17 | 1989-02-14 | Spengler Charles W | Clean air facility |
-
1988
- 1988-02-19 DE DE3805212A patent/DE3805212A1/en active Granted
-
1989
- 1989-02-16 EP EP89102615A patent/EP0329119B1/en not_active Expired - Lifetime
- 1989-02-16 AT AT89102615T patent/ATE80538T1/en not_active IP Right Cessation
- 1989-02-17 US US07/312,739 patent/US4951555A/en not_active Expired - Lifetime
- 1989-02-20 CA CA000591549A patent/CA1327225C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE3805212C2 (en) | 1990-08-16 |
| US4951555A (en) | 1990-08-28 |
| ATE80538T1 (en) | 1992-10-15 |
| DE3805212A1 (en) | 1989-08-31 |
| EP0329119A2 (en) | 1989-08-23 |
| EP0329119A3 (en) | 1990-01-03 |
| EP0329119B1 (en) | 1992-09-16 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |
Effective date: 20110222 |